Your Query returns 3 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
C4ST1NM_02143910090C4s    C4ST    C4ST-1    Chst11   
C4ST1BC0133159606C4ST    HSA269537    C4ST-1    CHST11   
C4ST1NM_0184139606C4ST    C4ST-1    HSA269537    CHST11   

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* OMIM link based on symbol match for human and mouse.

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Text2Knowledge ... Yong Huang 2002